yes, you are exactly right, it isn't casa's decision, they have nothing at all to do with it.
the wa gov't makes the decision and, rightly or wrongly, they have decided to not open any of skywest's routes up to competition (APART FROM GEL-KALBARRI) as there is simply not enough demand, also skippers has an advantage in that they can subsidise loss making rpt serivces with their profit-making charter services...
if you want the facts, read the report at
www.dpi.wa.gov.au, it hasn't got anything to do with CASA